VeePee is aimed at KDE and GNOME application developers and allows you to easily embed Python as a GUI-enabled scripting language in your application. Users benefit from a common scripting language allowing them to develop scripting skills that are re-usable with all their applications. The same VeePee script uses KDE widgets when run from a KDE application, and GNOME widgets when run from a GNOME application.

MayaVi is a free, cross platform, easy-to-use scientific data visualizer. It
provides a powerful GUI to ease the visualization process. It is written in
Python and uses the Visualization Toolkit (VTK) for the graphics. MayaVi can be
scripted from other Python programs and also from the interactive Python
interpreter. MayaVi includes the VTK Pipeline browser. The VTK Pipeline browser
is a Python module (vtkPipeline) that enables one to view and configure the
objects in the VTK pipeline graphically with a Tkinter-based GUI. The browser
should work for any Python script that uses VTK. MayaVi also provides classes
to pickle a VTK object and a simple class documentation browser.

Python XmlTools is a set of high level tools to help using XML in Python. It features two pyGTK widgets, XmlTree and XmlEditor, which can respectively display and edit an XML document in a graphical fashion.

Libxslt is a C library for GNOME which allows developers to work with XSLT. It is based on libxml for XML parsing, tree manipulation, and XPath support. Also included is 'xsltproc', a command line XSLT processor. The library is written in plain C, making as few assumptions as possible, and sticking closely to ANSI C/POSIX for easy embedding. It should work on Linux, Unix, and Windows. Though not designed primarily with performances in mind, libxslt seems to be a relatively fast processor. It also include full support for the EXSLT set of extension functions as well as some common extensions present in other XSLT engines.

py-xmlrpc is an extremely fast implementation of the xmlrpc spec for Python (written in C). It supports both blocking and non-blocking clients and servers on Windows and POSIX platforms. Version 0.8.1 is 100% compliant with the xmlrpc validator found at http://validator.xmlrpc.com.

QuantLib is a cross-platform, quantitative finance
C++ library for modeling, pricing, trading, and
risk management in real-life. It is also wrapped
as Python/Ruby/Scheme modules. Extensions for
Excel, R, and Mathematica are available. Other
such extensions are under consideration. QuantLib
offers tools that are useful both for practical
implementation and for advanced modeling. It
features market conventions, yield curve models,
solvers, PDEs, Monte Carlo (low-discrepancy
included), exotic options, VAR, and so on.

PyStem is a fast Python module with the the Porter
stemming algorithm (a process for removing the
commoner morphological and inflexional endings
from words in English; its main use is as part of
a term normalisation process that is usually done
when setting up Information Retrieval systems).